Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4859986 | Object touchdown and net contact detection systems and game apparatus employing same | M. Gene Kaufman | 1989-08-22 |
| 4664378 | Electrically conductive tennis ball | — | 1987-05-12 |
| 4433840 | Electrically conductive game ball | — | 1984-02-28 |
| 4299384 | Electrically conductive game ball | — | 1981-11-10 |
| 4299029 | Method of making an electrically conductive game ball | — | 1981-11-10 |
| 4281921 | Plural color anti-copying systems for xerographic and electrostatic copying machines | — | 1981-08-04 |
| 4189143 | Tennis scorekeeper | Lorraine A. Van Auken | 1980-02-19 |